Stable carbon and oxygen isotope ratios of bulk sediment from DSDP Hole 62-463 (Appendix A)

In order to elucidate early Aptian marine paleotemperature evolution across the period of enhanced organic carbon (Corg)-burial [Oceanic Anoxic Event (OAE) 1a], stable isotope analyses were performed on pelagic limestones at Deep Sea Drilling Project Site 463, central Pacific Ocean. The delta18O data exhibit a distinct anomaly by ~-2? spanning the OAE 1a interval (i.e., a ~6 m-thick, phytoplanktonic Corg-rich unit constrained by magneto-, bio- and delta13C stratigraphy). Elucidation of paleotemperature significance of the delta18O shift is made by taking account of recent Sr/Ca evidence at the same section, which revealed that geochemical signals in carbonate-poor lithologies are relatively unaltered against burial diagenesis. By discriminating delta18O values from carbonate-poor samples (CaCO3 contents=5-30 wt.%), it appears that an abrupt rise in seasurface temperatures (SSTs) by 8 °C (=-1.7? shift in delta18O) occurred immediately before OAE 1a, whereas a cooling mode likely prevailed during the peak Corg-burial. In terms of its stratigraphic relationship as to the Corg-rich interval and to a pronounced negative delta13C excursion, as well as its timescale, the observed SST rise resembles those associated with the Paleocene-Eocene thermal maximum and, more strikingly, Jurassic Toarcian OAE. This observation is consistent with the hypothesis that these paleoenvironmental events were driven by a common causal mechanism, which was likely initiated by the greenhouse effect via massive release of CH4 or CO2 from the isotopically-light carbon reservoir and terminated by a negative productivity feedback.

Juvenile delinquency, Chicago, Ill. Hearing before the Subcommittee on the Judiciary, United States Senate, Eighty-fourth Congress, first session, Pursuant to S. Res. 62, investigation of juvenile delinquency in the United States.

Mode of access: Internet.

Juvenile delinquency, Pittsburgh, Pa. Hearing before the Subcommittee to Investigate Juvenile Delinquency of the Committee on the Judiciary, United States Senate, Eighty-fourth Congress, first session, pursuant to S. Res. 62, investigation of juvenile delinquency in the United States. December 7, 1955.

Mode of access: Internet.

The use of computers in engineering education; report. 1st-3d; 1960-62.

Cover title, 1960: Electronic computers in engineering education; report.

A survey of bioastronautics, 1961-62; resources for research and development.

"Contract no. AF 18(600)-1916."